Molding pattern



Patented Aug. 28, 1928.

AIIGU'ST J. SMITH, OF CHICAGO, ILLINOIS.

MOLDING- PATTERN.

Application filed April 30, 1925. Serial No. 27,052.

This invention relates to a pattern for casting or molding a device with roundedv corners which are susceptible of being enameled.

In enameling articles, it is necessary that all corners of such articles be of rounded form; sharp corners cannot 'be enameled, and if articles with -sharp .corners are cast, formed or made, such sharp corners have to be made of round form before they can be enameled. This involves a great deal of time and labor.

It is an object of this invention to provide a molding pattern which will produce rounded coiners especially upon spokes or members that connect an annular rim with another portion of a device,rand that can be. withdrawn from the molding sand without inj uring or destroying the mold.

The invention comprises the novel structure and combinations hereinafter described and more particularly pointed out and defined in the appended claims.

In the accompanying drawings which illustrate a preferred embodiment of this invention and in which similar reference numerals refer to similar features in the different views:

Figure 1 is an elevational view of the completed glass and tooth brush holder.

Figure 2 i-s an inside plan view of the pattern from which the cope of the flask is made.

F igurc 3 is a fragmentary sectional view upon the line III-III of Figure 2.

Figure 4 is an enlarged sectional view through a mold, the upper part of the device being cast.

Figure 5 is a diagrammatic view of a portion of a rim illustrating the old mold structure.

Figure 6 is a diagrammatic view of a portion of a rim illustrating an impossible structure to cast.

Figure 7 is a diagrammatic view of a portion of a rim illustrating a structure made in accordance with this invention.

This invention is illustrated in connection with the casting or molding of a combined tumbler and tooth brush holder having an upper annular rim 1 from which depend a plurality of spaced posts 2 with vrounded edges 2l which can be enameled. The lower ends of these posts are connected by a cross 3 which has a hollow boss or socket 4 at its lower end for attachment of the tooth brush rack 5. An attaching bracket 6 extends laterally from one post for attaching the device to a wall or the like. It should, however. bc understood that while this invention is illustrated in connection with such a holder, it is applicable to any other form of device having a rim with ribs or posts that are to be enameled.

In the casting or molding of articles, a pattern is usually constructed from which the cope and drag of the flask are constructed. I-Iitherto in the molding of a device having a rim with spaced arms, posts or branches, the corners of the iibs on the pattern were made sharp to produce a post 12 with sharp edges 13 as shown in Figure 5 to bring the line of clearage coincident with the interior of the rim of the article in order that the cope pattern could be withdrawn from the mold. Before an article produced in this manner could be enameled, it was necessary to make the corners 13 of rounded form.

If it were attempted to cast the post 12 with rounded edges for enameling purposes, as shown by the post 13 in Figure 6, the line of clearage of the mold would be at 14 underneath the rim and it would be impossible to withdraw the cope pattern from the sand without destroying the mold. To overcome this difliculty I have constructed the cope pattern 11 as shown in Figure 2 with inwardly extending ribs 7 having rounded edges, and which are halves of the posts 2 thus bringing the line of'clearage of the mold coincident with the interior surface of the rim of the pattern whereby the cope pattern can be drawn clean from the sand and whereby the cast article will have all parts with rounded edges for enameling purposes. In Figure 7 I have illustrated a post cast by this pattern in which the interior half of the post represents the ribs 7 on the cope pattern. In referring to said ligure, it will be noted that the edges of the post are rounded, and that the line 15 representing the interior of the rim bisects the post. This line 15 corresponds to the line 15n on the cope pattern (Figure 2) and denotes the line of cleavage of the mold. It will be evident that a. cope pattern constructed in accordance with this invention vwill form posts with yrounded corners and will be susceptible of ready withdrawal from the sand without injuring or destroying the mold.

In Figu-re 4 there is illustrated a flask comprising the cope 8 and the drag 9 between which the tumbler receptacle of the holder is being cast.

It will be appreciated that according to l this invention it becomes possible to mold or cast members with rims having arms Yor posts with rounded corners or edges that can immediately be enabeled without any filing or grinding that has hitherto been necessary for bevelling the edges or corners.

l am aware that many changes may be made, and numerous details of construction may be varied through a wide range without departing 'from the principles oi this invention, and ll therefore do not purpose limiting the patent granted hereon, otherwise than necessitated by the prior art.

I claim as my invention:

l. A pattern for molding an annular device having spaced depending posts, comprising a member having an interior cavity with inwardly spaced ribs having a thickness substantially equal to one halt of the thickness of said posts.

2. A pattern for molding purposes comarisino' a member havin(r an interior cavitv C C3 u 5 with spaced ribs 'projecting inwardly from the walls of such cavity, said ribs having rounded edges.

3. A pattern for molding an annular device having spaced dependingl posts, comprising a member having a cup shaped cavity with spaced ribs on the wall of such cavity, the plane through the base of said ribs passing within the contines of said cavity.

1l. A pattern :for molding device having a rim withposts, comprising a member having a cup shaped'in'terior with inwardly extending ribs with rounded edges.

n testimony whereof l have hereunto subscribed my name.

AUGUST J. SMITH. 

